ancient settlements

An ancient settlement and mummy about three thousand years old have been discovered in the vicinity of Yemen's capital Sanaa.

Human ancestors from about 9,000 years ago have faced modern urban problems such as overpopulation, violence and environmental hazards.

NASA's remote sensing device helps researchers find the remains of a 10,500-year-old settlement in the Oklahoma state forest.

This is a permanent settlement because most of the buildings found have undergone many stages of construction and repair.